The best replacement for afr is lambda.

The best alternatives to afr are rated as following:
★★★★★  lambda
★★★★  sfr
★★★★  brodix
★★★★  trick flow
★★★  tfs
★★★  edelbrock heads
★★★  mtbf
★★★  dart
★★★  egt
★★  dart heads
★★  trick flow heads
★★  ang
★  co
★  adjusted afr
★  profiler
★  edelbrock
★  vortec heads
★  ls3 heads
★  rhs
  trickflow
  twisted wedge
  timing
  gt40 heads
  brodix heads
  canfield
  trickflow heads
  vortec head
  patriot heads
  victor jr heads
  dart pro 1
  rhs heads

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Google Trends

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afr
lambda
sfr